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In an investigation by The Mirror , ten of the samples included spiny dogfish, classified as endangered in Europe, and on the International Union for Conservation of Nature's red list of threatened species.

British chippies have been selling threatened shark as 'rock salmon' (Image: Getty)

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The other five contained another threatened species of shark, the starry smooth-hound.

One chippy told the paper: "I had no idea."

The Marine Conservation Society said the research shows "most customers are completely unaware of what they're eating".

Exeter University bioscientist Greg Wannell, who carried out the tests, said of the threatened species: "These sharks typically take a long time to reach sexual maturity and, once they do, produce relatively few young compared to most fish commercially caught."